<!doctype html>
<html ng-app>
<head>
<link rel="stylesheet" href="">
<script src="http://code.angularjs.org/angular-1.0.1.min.js"></script>
</head>
<body>
	Your name:
	<input type="text" ng-model="yourname" placeholder="World">
	<hr>
	Hello {{yourname || 'World'}}!
</body>
<script type="text/javascript">
</script>
</html>